TOKO Inductors Needed for EM Theremin!

The Hammond inductors could work too.

(* jcl *)

At Farnell I've actually found the 6304 (5 mH) and the 6306 (10 mH). They are in stock and I those will work. However, which of the 2.5mH inductors from Hammond? There is the 1503, 1504, and 1505.

Do you have any experience ordering from Farnell (A U.K. company)?

I have no experience with Farnell. With a weak
dollar it could get expensive.

There is no current in this application so
the 1503, 1504, 1505 should all work.
I would go with the lowest cost part.
If they are all about the same price I would
use the 1505 since it has a lower resistance.

(* jcl *)

It actually turns out that Bourns still makes the inductors I need..there was a mistake by Bourns in saying they were discontinued. Also, Farnell supplies all the RF Choke inductors listed in the plans (Certain parts of Farnell's and Newark's websites are down, so I hope I can order over the phone or via email). Since these inductors and some ICs are the only things I need from Farnell, I think I'll just go ahead and get them from there.

Finally, I think I'm back to a place where I have everything as outlined in the plans except the variable inductors, but my substitutes are worth trying I think(?). Once I learn if I'll be able to order from Farnell, I think it's safe for me to start ordering and building...(???)

Thanks,
Dan

Hi,

I've got a general question about soldering:
If I'm not mistaken, the PC Board I ordered has no copper strips. Do I melt the solder onto the board and the lead to hold it in place and then solder lead to lead, or should I solder lead to Vector clip, or use buss-wire? What will the basic process be for me?

Thanks

The T42-1 clips (or K24A pins) are junctions.
Place the component leads and buss wire in the
the clips, place your iron on the clip and then
reflow solder onto the heated clip.

In my pictures you should be able to see the
leads and solder ---

http://www.luciani.org/getting-it-done/assembly-hints/assembly-hints-index.html#breadboard-hints

(* jcl *)

Thanks...

That method seems like it will help eliminate shorts a little better than the copper plated boards.

It doesn't appear that you actually put the leads through the board's holes...? Do you just use the holes to hold the Vector clips? Are there any cases where I'll need to put the leads through the holes?

[i] I would recommend purchasing a connector like the Qualtek 703W-00-52 and wiring it according to
the Qualtek documentation. This will let you use
a standard removable AC cord. [/i]

When it comes to the power supply input, should I mount my RadioShack transformer inside the Theremin box, and have a standard extension cord plug into the box. Then those wires would lead to the transformer and I could carry the earth ground from the extension cord to the circuit. Should I use a Qualtek 703W-00/08 or the Qualtek 703W-00-52 (that you mentioned). If I were to use one of these input adapters, would they accept a standard extension cord? Which of the two Qualteks would work better for me. Is the mounting style a concern? I'd want to be able to mount the adapter on the back of the Theremin box, so would a screw mount be what I need? What is the PCB mount?

Do I need to carry a ground to the inside of the transformer's housing for safety?

[i]When it comes to the power supply input, should I mount my RadioShack transformer inside the Theremin box, and have a standard extension cord plug into the box. Then those wires would lead to the transformer and I could carry the earth ground from the extension cord to the
circuit. Should I use a Qualtek 703W-00/08 or the Qualtek 703W-00-52 (that you mentioned). [/i]

I would put the power supply (including the linear regulators) into a separate box. This keeps high voltage isolated from your main circuitry. Also you may be able to share the power supply with other projects.

Large metal objects near the oscillators could effect the operation of the Theremin.

[i]If I were to use one of these input adapters, would they accept a standard extension cord? [/i]

Extension cords usually do not have IEC320 connectors on one end. However it is a common connector for "standard" power cords.

[i]Which of the two Qualteks would work better for me. Is the mounting style a concern? I'd want to be able to mount the adapter on the back
of the Theremin box, so would a screw mount be what I need? What is the PCB mount?
[/i]

You are probably better off with the 703W-00/08.

[i]
Do I need to carry a ground to the inside of the transformer's housing for safety?
[/i]

I would enclose the power supply (which includes the transformer) in an insulating box. Unless the transformer manufacturer recommends connecting
the housing to earth ground I would not.

(* jcl *)